Alternatively, you may wish to visit www.aboutcookies.org which contains comprehensive information on how to do this on a wide variety of browsers. You will also find details on how to delete cookies from your computer as well as more general information about cookies.
For information on how to delete cookies on the browser of your mobile phone you will need to refer to your handset manual.
Please be aware that restricting cookies may impact on the functionality of our websites.
Double Click is used by our websites to publish advertising. This service gathers information on regarding visits made by users which is used to decide on the insertion of adverts.
How to reject or delete this cookie
To support our journalism, we sometimes embed photos and video content from websites such as YouTube and Flickr. As a result, when you visit a page with content embedded from, for example, YouTube or Flickr, you may be presented with cookies from these websites. NWN Media Ltd. or our publication websites do not control the dissemination of these cookies. You should check the relevent third party websites for more information about these.
What is a cookie?
A cookie is a piece of information in the form of a very small text file that is placed on an internet user’s hard drive. It is generated by a web page server, which is basically the computer that operates a web site. The information the cookie contains is set by the server and it can be used by that server whenever the user visits the site. A cookie can be thought of as an internet user’s identification card, which tell a website when the user has returned.
What does a cookie look like?
Below is the content of a typical cookie. This one is from the Hotmail service and has the filename firstname.lastname@example.org (.txt is the standard filename extension for text files):
HMP1 1 hotmail.msn.com/ 0 1715191808 32107852 1236821008 29449527 *
The codes will only make sense to Microsoft’s MSN Hotmail Servers.
History of Cookies
Cookies for the internet were originally developed in 1995 by the Netscape Communications Corporation. The word ‘cookie’ comes from ‘magic cookie’, a term in programming languages for a piece of information shared between co-operating pieces of software. The choice of the word cookie appears to come from the American tradition of giving and sharing edible cookies.
What is the purpose of cookies?
Cookies make the interaction between users and websites faster and easier. Without cookies, it would be very difficult for a website to allow a visitor to fill up a shopping cart or to remember the user’s preferences or registration details for a future visit.
Cookies enable websites to monitor their users’ web surfing habits and profile them for marketing purposes (for example, to find out which products or services they are interested in and send them targeted advertisements).
Are there different types of cookies?
Cookies come in different flavours:
Session, or transient cookies
Cookies that are stored in the computer’s memory only during a user’s browsing session and are automatically deleted from the user’s computer when the browser is closed.
These cookies usually store a session ID that is not personally identifiable to users, allowing the user to move from page to page without having to log-in repeatedly. They are widely used by commercial websites (for example, to keep track of items that a consumer has added to a shopping cart).
Session cookies are never written on the hard drive and they do not collect any information from the user’s computer. Session cookies expire at the end of the user’s browser session and can also become no longer accessible after the session has been inactive for a specified length of time, usually 20 minutes.
Permanent, Persistent, or Stored Cookies
Cookies that are stored on the user’s computer are not deleted when the browser is closed. Permanent cookies can retain user preferences for a particular website, allowing those preferences to be used in future browsing sessions.
Permanent cookies can be used to identify individual users, so they may be used by websites to analyse users’ surfing behaviour within the website. These cookies can also be used to provide information about numbers of visitors, the average time spent on a particular page and generally the performance of the website. They are usually configured to keep track of users for a prolonged period of time, in some cases many years into the future.
If you have Adobe Flash installed on your computer (most computers do), small files may be stored on your computer by websites that contain Flash Media, such as video clips. These files are known as Local Shared Objects (LSOs) or Flash Cookies. They can be used for the same purposes as regular cookies (properly called HTTP cookies).
Flash cookies can also backup the data that is stored in a regular cookie. When you delete cookies using your browser controls, your Flash Cookies are not affected. So a website that served a cookie to you may recognise you on your next visit if it backup up its now-deleted cookie to data to a Flash Cookie.
Are cookies dangerous?
No. Cookies are small pieces of text. They are not computer programs, and they can’t be executed as code. Also, they cannot be used to disseminate viruses, and modern versions of both Microsoft Internet Explorer and Netscape browsers allow users to set their own limitations to the number of cookies saved on their hard drives.
Can cookies threaten users’ privacy?
Cookies are stored on the computer’s hard drive. They cannot access the hard drive – so a cookie can’t read other information saved on the hard drive, or get a user’s email address etc. They only contain and transfer to the server as much information as the users themselves have disclosed to a certain website.
A server cannot set a cookie for a domain that it is not a member of. In spite of this, users quite often find in their computer files cookies from websites that they have never visited. These cookies are usually set by companies that sell Internet Advertising on behalf of other websites. Therefore it may be possible that users’ information is passed to third party websites without the users’ knowledge or consent, such as information on surfing habits. This is the most common reason for people rejecting or fearing cookies.